Winter Bird(2007)

Winter Bird is a Korean drama that traces the tangled lives of four people bound by love and regret. Young Eun, raised as an orphan, fell in love with Do Hyun years ago, but his family's disapproval forced her to marry Joo Kyung Woo, a charming doctor who secretly answers to his domineering mother. When Do Hyun marries Jin Ah, a pediatric resident who harbors feelings for him, the carefully constructed lives of all four begin to unravel. Young Eun, exhausted by her husband's divided loyalties, finally leaves him. Now separated from Do Hyun by marriage and circumstance, Young Eun must confront whether the love they abandoned years ago can be rekindled, or whether some bonds are meant to remain broken.